Why do we need VLAN tagging?

Related questions

1. What is a tag name?
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3. What is encapsulation dot1q?
4. How do I add a tag to metadata?
5. What is the purpose of VLAN tagging?
6. How do I use visual mode in Vim?
7. What are smart tags in Word?
8. How can VLAN hopping be avoided?
9. Is VLAN tagging secure?
10. Can you tag files in Windows?

Tags

1. #tagged
2. #access
3. #single
4. #trunk
5. #speaking
6. #purpose
7. #whereas
8. #untagged
9. #traffic
10. #accepts
11. #generally
12. #multiple
13. #devices
14. #switches
15. #ports
16. #trunked